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    CVE-2026-8932

    libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

    Published:Jul 3, 2026
    Last Modified:Jul 6, 2026
    EPS:Jul 3, 2026
    EPSS Score:0.00129
    CVSS Score:7.5

    Affected Products

    Vendor
    Curl
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3733910https://hackerone.com/reports/3733910https://github.com/0xBlackash/CVE-2026-8932

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-80230 (CVSS 7.5) — When `CURLOPT_PINNEDPUBLICKEY` is configured alongside options that disable standard peer verification (`CURLO…
    CVE-2026-80229 (CVSS 7.5) — When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating …
    CVE-2026-19931 (CVSS 9.8) — A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authent…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High